Blgwpipe



E. L. RAGONNET.

BLOWPIPE.

APPLICATION FILED JAN. l3. 1921.

Patented May 30, 1922.

um'rso STATES PATENT OFFICE.

' 1110.; A CORPORATION OF NEW YORK.

i BLowHrE.

Specification of Letters i Patent. Patented May 3Q, 1922.

Application filed- January 13, 1921. Serial No.436,939.

invented certain new and useful Improvements in Blowpipes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to-m'ake and use the same.

This invention relates to cutting blowpipes, employing oxidizing and combustible gases such as oxygen and acetylene and I utilizing a jet of the oxidizing gas to cut Inaterial by oxidation thereof after it has been raised to the ignition temperature by a prev heating flame or flames. In such blowpipes,

three pipes or conduits for the gases are usually provided, one for the combustible gas,

another for oxidizing gas which is mixed with the combustible gas to produce the pre-' heating flames, and a third which conveys oxi dizing gas for the cutting jet. The conduits supplying the heating flames are controlled by manually-operable valves to permit regulation. The third conduit in an ordinary two-connection blowpipe receives oxidizing gas from an inlet supplying both oxidizing gas conduits; the flow of oxidizing gas to provide the cutting jet being controlled by a manually. operable valve which is capable of rapid manipulation. This arrangement permitsthe opening and closing of the valve controlling the cutting jet with the facility required in the satisfactory operation of the blowpi e, and 1t 1s to the arrangement for.

control ing the cutting jet valve that the present invention is directed.

It is the object of the invention to provide a simple andinexpensive controlling valve for the cutting jet with operating mechanism so arranged as to insure positive operation with a minimum of effort and de flection of the 'et.

A further 0 ject of the invention is the provision of a cutting blowpipe which may be inexpensively constructed and assembled,

and which is free from parts liable to derangement in use, whereby maximum utillty and operativeflife thereof isassured.

Further objects and advantages of the invention will be apparent as it is better understood by reference to the followmg speci- Fig. 1.

fication and the accompanying drawing, in Which- EUGENE L. RAG-ONNET, OF MIAMI, FLORIDA, ASSIGNOR TO AIR-REDUCTION COMPANY,

. Fig. 1 is a side elevation partially in section, illustrating a blow pipe constructed in accordance with the invention.

Fig. 2 is a section on the line 2-2 of Fig.1. Fig. 3 is a section on the line 3-'-3 of Fig. 1, and

Fig. 4 is a section on the line i -4 of Referring to the drawing, 5 indicates the head of a blowpipe, which is provided with interchangeable tips 6. "A nut 7 holds the tip in assembled relation with the head and permits removal and replacement thereof. oxidizing and combustible gases are supplied to suitable passages in the head through pipes or conduits 8, 9 and 10,; the conduit 8 carrying acetylene, for example, the conduit 9 carrying oxygen for the heating flames and the pipe 10 carryingoxygen for the cutting jet. The details of the blowpipe head and tips form no part of the present invention'and may vary within wide limits; various commercial structures being recognized and approved by those skilled in the art. 7 The conduits 8, 9 and 10 are enclosed at their rear ends within a'casing 11, forming the handle of the blowpipe, and the conduit 10 terminates in a block 12 which is secured within the casing, the "ends of the conduit ,Joeing preferably silver soldered into a passage 33 formed in the block. "The conduits 8 and 9 may be similarlyconnected to the block. but conveniently theyextend through openings therein and rearwardly thereof to a butt 13, and are secured thereto in communication with. passages 14 and 15, controlled by manually operable valves 16 and 17 of the usual type. The butt 13 is provided with nipples 18 adapted for connection with flexible conduits, which deliver the The block 12 is providedvwith a valve chamber 21 communicating with the passages 20, and supports a valve housing22,

which is threadedly mounted in the block so preferably provided with an annular facing of vulcanite or similar material to ensure a leak-proof joint between the lip and the valve 23 when the latter is closed.

The valve 23 is actuated to lift it from the lip 25 by a stem 28 in loose engagement therewith and projecting through the outlet 26 and a stufiing box 29 which prevents escape of the gas-about the stem. The-stem is preferably provided with a flattened head,

which is adapted to be engaged by a surface preferably a roller 30. The roller 30 is mounted on a trigger 31, which is pivoted in a bracket 32, and capable of swinging movearranged in movable contact with the stem,

ment to force the stem 28 and the valve 23 backwardly, thus permitting oxidizing gas ratus, it is manifest that to flow through the outlet '26 and thence through a passage 33 to the conduit 10. The bracket 32 is preferably a separate part, which is secured to the block 12 by screws 34, to permit removal of the trigger when it is necessary, for example, to repack the stem 28. The trigger 31 is preferably formed with two arms, 35 and 36, the former of which is adapted to be engaged by the 'fingers in swinging the trigger rearwardly to open the valve, the other arm resting in engagement with the back of the fingers in order that the valve may be readily released when the roller has passed the center and holds thevalve in open position. From the foregoing, it will be understoo that the structure described, presents nu merous advantages, particularly in its simplicity and the ease with which it may be dismantled for replacement or repair as compared with similar devices heretofore available. By removing the screws 34, the

bracket 32 may be withdrawn with'the trig,- ger, thus giving access to the packing in the stuffing box 29 and stem 28. The valve housing 22 may also be removed by simply unscrewing it from the block. Since these parts require attention from time to time to ensure maximum efficiency ofthe appaa blowpipe embodying the features noted, represents a distinct improvement in" the art.

The operation is equally simple. To open the valve for the purpose of supplying oxidizing gas to the cutting jet, it is necessary only to pull the trigger rearwardly until the roller 30 passes the center. The valve .roller passes said axis.

In testimony whereof I aifix my signa-' mamas is thereafter held open without further manipulation of latches or other locking de-. vices until the operator moves the trigger in the opposite direction, when the valve closes underthe actuation of the spring 24. The operation may be accomplished without exerting any considerable force on the trigger and the alignment of the cutting jet on the work is not disturbed as it frequently is in the operation of previously known cutting blowpipes.

Various changes may be made in the form and arrangement of the parts without departing from the invention or sacrificing any of its material advantages.

I claim:

1. In a cutting blowpipe, the combination including a conduit for oxidizing gas to supply the cutting jet and conduits for oxidizing and combustible gases to supply the heating flames, a casing surrounding the rear portions of the conduits and forming a handle of theblowpipe, a block within the handle having a valve chamber, means for delivering oxidizing gas to the valve chamber, a valve within the valve chamber to controlthe oxidizing gas for the cutting jet, a

valvestem projecting through the handle, and a pivoted trigger having. a roller contacting with the stem to actuate the valve when the trigger is turned about its pivot,

including a conduit for oxidizing gas to supply the cutting jet and conduits for oxidizing and combustible gases to supply the heating flames, a casing surrounding the rear portions of the conduits and forming a handle of the blowpipe, a'block within the handle intermediate the ends thereof and having a valve chamber, means for delivering oxidizing gas. to the valve chamber, a valve within the chamber, a stem loosely engaging the valve, a, stuffing box surrounding and supporting the stem and means outside the handle for actuating the valve stem, consisting of a removable bracket secured to the block and a trigger pivotally mounted therein and having a roller adapted to contact with the stem, the pivot of the trigger being offset from the axis of the stem whereby the valve is held in open position when the ture.

EUGENE IL. RAGONNET. 

